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How Security Scanners Cause Network Outages - CoPP and ARP Glean in Production Networks

Note: If you are not familiar with the concepts of the data plane and control plane on network devices, I highly recommend reviewing my Understanding the Data, Control, and Management Planes of ...

Defining Ethernet Physical Layer Terminology

Networking jargon can be context-sensitive, and many terms are often used interchangeably in conversation. In this article, I will define terms often used when discussing the physical layer of Ethe...

How to Create a Simple, Free Blog with Hugo and GitHub Pages

Authoring technical content is a skill. Like any skill, the only way to improve it is to practice. An easy way to author and share technical content is to create a blog and share your technology ex...

Bridge Network Interfaces on Ubuntu 22.04

Linux hosts can bridge two network interfaces together such that they behave link a normal Ethernet link. This means that traffic entering one network interface will exit the other network interfac...

Installing iPerf3 on Ubuntu 22.04

iPerf3 is a popular network performance measurement and testing tool that can be easily installed on most Linux operating systems. This article will walk through how to install iPerf3 on Linux host...

Understanding ARP Glean

Note: If you are not familiar with the concepts of the data plane and control plane on network devices, I highly recommend reviewing my Understanding the Data, Control, and Management Planes of ...

Illustrating Why the First ICMP Ping is Lost

Whether you are learning about computer networking through practice labs or are a veteran network administrator, you may have noticed that occasionally, when you test reachability to a specific dev...

How to Create a Simple, Free Blog with Jekyll and GitHub Pages

Authoring technical content is a skill. Like any skill, the only way to improve it is to practice. An easy way to author and share technical content is to create a blog and share your technology ex...

TAC Tales - How IP SLA and Static Routes Ruined Christmas

It was Christmas Day of 2019, and I was working the holiday shift in Cisco TAC. Working Christmas is enjoyable - it tends to be quiet, and in the rare case you need to assist with an issue or outag...

Practical Python - Identifying Congested Interfaces of Nexus 5500 Switches

Overview A common support case I have seen during my career in Cisco TAC is where customers observe intermittently incrementing input discard counters on one or more interfaces of a Cisco Nexus 55...

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